Timberlake and Biel married in 2012 and welcomed their first child, son Silas, three years later.
During their chat, JT revealed that Ellen was one of the few people “outside of the immediate family” to learn about Biel’s second pregnancy.
“I think we were FaceTiming and you said, ‘Hey, you want to know a secret?’ and then Jessica walked in and you put your hand on her stomach. You were like, ‘I’m having another baby!'” the talk show host recalled.
In September, Timberlake’s former *NSYNC bandmate Lance Bass revealed news about Phineas’ arrival while speaking with Entertainment Tonight. Reports swirled last summer that the couple had welcomed a second child, but neither had spoken publicly.
Watch a snippet of Timberlake’s appearance on Ellen below.